Applying roof tilles on cone shaped roof in Blender?
I have not unwrapped anything (successfully) before, but here is an idea. In GIMP, open your image:


At the top choose filters>distorts>polar-coordinates and set it up as shown:


It will be easier to map to your cone, and the tiles will point towards the top, but they will be longer towards the bottom I think, so . . . You can try that if you want. :D